empty package on one line parsing error

Question

If I do this

skinparam package {
  BackgroundColor LightBlue
  ArrowColor Black
  BorderColor Blue
  BackgroundColor<<stereo>> PaleGreen
}
package test1 {}
package test2 <<stereo>> {}

I get an error on the line package test2 <<stereo>> {}

But if I change it to

package test2 <<stereo>> {

}

There is no error and the stereotype works.